Extracts a target function and its local dependency tree from a script, returning a compact code slice for follow-up reverse analysis.
AI agents call extract_function_tree to retrieve information from JS Reverse MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs static analysis of JavaScript source code to understand function structure and dependencies. It reads code and produces output for analysis, with no side effects, execution of arbitrary code, data modification, or destructive operations. The most severe category applicable is Read.
From the tool's definition Tool 'extracts a target function and its local dependency tree from a script, returning a compact code slice' — purely retrieves and analyzes code without modifying, executing, or deleting anything.
Attacks that exploit this kind of access
Extracts a target function and its local dependency tree from a script, returning a compact code slice for follow-up reverse analysis. It is categorised as a Read tool in the JS Reverse MCP MCP Server, which means it retrieves data without modifying state.
Register the JS Reverse MCP server in PolicyLayer and add a rule for extract_function_tree: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches JS Reverse MCP. Nothing to install.
extract_function_tree is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the extract_function_tree rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for extract_function_tree. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
extract_function_tree is provided by the JS Reverse MCP server (noone-hub/jsreverser-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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